Xiao Ming from Obana took part in the math contest, and they got a total score of 168. Xiaohua's score is 42 points less than Xiaoming's twice. How many points did they each get?
Suppose Xiaoming's score is X, how can Xiaohua's score be 2x-42?
There is x+2x-42= 168.
3x=2 10
x=70
So 2x-42=98 points.
Xiaoming got 70 points and Xiaohua got 98 points.